Jannoch studied piano and composition at the Hochschule für Musik "Hanns Eisler".
Afterwards he was a répétiteur at the Leipzig Opera and at the Deutsches Nationaltheater und Staatskapelle Weimar.
He taught music theory at the Hochschule für Musik "Hanns Eisler" Berlin and is considered a sponsor of Helmut Zapf.
[4] His works have been published by Breitkopf & Härtel in Leipzig and were performed by the Staatskapelle Weimar, among others.
[5] In 2001, the composer Hermann Keller dedicated the piece "Klavierstücke für Lehrer, Kollegen und Freunde" to him.